git.m6w6.name Git - m6w6/ext-psi/blob - src/types/decl_struct.c

   1 /*******************************************************************************
   2  Copyright (c) 2016, Michael Wallner <mike@php.net>.
   3  All rights reserved.
   4
   5  Redistribution and use in source and binary forms, with or without
   6  modification, are permitted provided that the following conditions are met:
   7
   8      * Redistributions of source code must retain the above copyright notice,
   9        this list of conditions and the following disclaimer.
  10      * Redistributions in binary form must reproduce the above copyright
  11        notice, this list of conditions and the following disclaimer in the
  12        documentation and/or other materials provided with the distribution.
  13
  14  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  15  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  18  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  21  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  22  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24 *******************************************************************************/
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #else
  29 # include "php_config.h"
  30 #endif
  31
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <assert.h>
  36
  37 #include "data.h"
  38
  39 decl_struct* init_decl_struct(const char* name, decl_args* args) {
  40         decl_struct* s = calloc(1, sizeof(*s));
  41         s->name = strdup(name);
  42         s->args = args;
  43         return s;
  44 }
  45
  46 void free_decl_struct(decl_struct* s) {
  47         if (s->token) {
  48                 free(s->token);
  49         }
  50         if (s->args) {
  51                 free_decl_args(s->args);
  52         }
  53         if (s->engine.type && s->engine.dtor) {
  54                 s->engine.dtor(s->engine.type);
  55         }
  56         free(s->name);
  57         free(s);
  58 }
  59
  60 void dump_decl_struct(int fd, decl_struct *strct) {
  61         dprintf(fd, "struct %s::(%zu, %zu)", strct->name, strct->align, strct->size);
  62         if (strct->args && strct->args->count) {
  63                 dump_decl_args_with_layout(fd, strct->args, 0);
  64         } else {
  65                 dprintf(fd, ";");
  66         }
  67 }
  68
  69 decl_arg *locate_decl_struct_member(decl_struct *s, decl_var *var) {
  70         if (s->args) {
  71                 return locate_decl_var_arg(var, s->args, NULL);
  72         }
  73
  74         return NULL;
  75 }
  76
  77 int validate_decl_struct(struct psi_data *data, decl_struct *s) {
  78         size_t i, pos, len, size, align;
  79
  80         if (!s->size && !s->args->count) {
  81                 data->error(data, s->token, PSI_WARNING,
  82                                 "Cannot compute size of empty struct '%s'",
  83                                 s->name);
  84                 return 0;
  85         }
  86
  87         for (i = 0; i < s->args->count; ++i) {
  88                 decl_arg *darg = s->args->args[i];
  89
  90                 if (!validate_decl_arg(data, darg)) {
  91                         return 0;
  92                 }
  93
  94                 assert(!darg->var->arg || darg->var->arg == darg);
  95
  96                 darg->var->arg = darg;
  97
  98                 if (!validate_decl_arg_args(data, darg, s)) {
  99                         return 0;
 100                 } else if (darg->layout) {
 101                         pos = darg->layout->pos;
 102
 103                         align = align_decl_arg(darg, &pos, &len);
 104
 105                         if (darg->layout->len != len) {
 106                                 data->error(data, darg->token, PSI_WARNING,
 107                                                 "Computed size %zu of %s.%s does not match"
 108                                                 " pre-defined size %zu of type '%s'",
 109                                                 len, s->name, darg->var->name, darg->layout->len,
 110                                                 darg->type->name);
 111                         }
 112                         if (darg->layout->pos != pos) {
 113                                 data->error(data, darg->token, PSI_WARNING,
 114                                                 "Computed offset %zu of %s.%s does not match"
 115                                                 " pre-defined offset %zu",
 116                                                 pos, s->name, darg->var->name, darg->layout->pos);
 117                         }
 118                 } else  {
 119                         if (i) {
 120                                 pos = s->args->args[i-1]->layout->pos +
 121                                                 s->args->args[i-1]->layout->len;
 122                         } else {
 123                                 pos = 0;
 124                         }
 125
 126                         align = align_decl_arg(darg, &pos, &len);
 127                         darg->layout = init_decl_struct_layout(pos, len);
 128                 }
 129
 130                 if (align > s->align) {
 131                         s->align = align;
 132                 }
 133         }
 134
 135         sort_decl_args(s->args);
 136
 137         if (s->args->count) {
 138                 decl_arg *darg = s->args->args[s->args->count-1];
 139
 140                 size = darg->layout->pos + darg->layout->len;
 141                 if (s->size < size) {
 142                         s->size = psi_align(size, s->align);
 143                 }
 144         }
 145
 146         return 1;
 147 }
 148
 149 size_t alignof_decl_struct(decl_struct *s) {
 150         if (!s->align) {
 151                 s->align = alignof_decl_args(s->args);
 152         }
 153         return s->align;
 154 }